Gas-heater.



T. J. McCARTHY.

GAS HEATER. APPUCATION FILED DEC. 9. 1912.

1 J UI 1 m Patented Apr. 27, 1915,

hun'H/S PETERb CO1.F'HOTO-L/THCLv WASHINGTON. n

GAS- HEATER.

Specification of Letters Patent.

Patented Apr. 27. 1915.

- Application filed December 9,1912. Serial No. 735,777.

To all whom it may concern Be it known that I, THOMAS J. Mo- CARTHY, a citizen of the United States, re-

siding at Cincinnati, in, the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Gas- Heaters, of which the following is a specification.

My invention relates toimprovements in gas heaters, such as heating stoves, furnaces and the like. 7

The object of my invention is to provide simple, economical and efficient means for burning all of the combustible gases in a gas heater, and it consists'in the device as herein fully illustrated, described and claimed.

In the drawing, which serves to illustrate my invention: Figure 1 is a vertical section of a gas heater equipped with my invention, showing the gas supply pipe and the return pipe in side elevation. Fig. 2' is a partial plan and section from the line 2-2 of Fig. 1 looking downwardly, with the artificial fuel removed, Fig. 3 is a front view showing the burner, mixer, lower end and outlets of the return pipe.

In the embodiment of my invention, as illustrated, and which shows a preferred construction, 1 represents aheating stove of a well known type having the usual doors 2 and 3. The stove is also provided with a gas burner l having a suitable mixer 5 to which gas is supplied through gas-pipe 6 controlled by valve 7. The bottom of the stove is preferably provided with air inlets 8 adjacent the gas-inlet and mixer. If desired suitable artificial fuel 9 may be used.

In using my invention I dispense with the ordinaryunsightly fume pipe and provide a suitable return pipe 10 extending from the top of the stove downwardly and into the bottom portion therof. The lower end of this return pipe is provided with a plurality of discharge outlets 11 in a plane intermediate of the burner 4: and mixer 5. This return pipe acts as a siphon to draw the unconsumed combustible gases from the stove above the burner downwardly and to discharge the same beneath the burner to be passed therethroughand burned and if any of such return products are not then burned the same will be continuously returned through said pipe until they are burned. In this way all of the perceptibly unpleasant odor is consumed.

In a heating apparatus for the burning of gas some of the gas does not become sufiiciently heated in passing from the mixer through the burner to secure perfect combustion and in such case where a fume pipe is used, this unburned or partially burned gas is carried off through'said pipe and wasted, thereby losing valuable heat units which by the use of my invention are retained and returned again and again to the burner until they are finally burned; This not only increases the heating capacity of the stove but also reduces the amount of fuel gas necessary to obtain a given amount of heat. 7

T lie-return pipe 10 may be constructed of cast metal, Russian iron, or of any other material suitable for the purpose and may be made'sufiiciently large to act as a heating drum to radiate additional room. I

My invention is capable of material departure from the scope or spirit thereof, as for instance, a greater number of discharge outlets .may be provided for the re turn pipe and suitably arranged upon a plane or planes intermediate of the mixer and burner.

What I claim as new and desire to se cure by Letters Patent is:

1. In a gas heater having an upper cham- 'ber provided with a gas burner therein,

and a lower chamber provided with a gas and air mixer therein, said mixer being arranged in a plane some distance below said gas burner, a return pipe communicat= ing with the upper portion of said upper chamber and extending downwardly into said lower chamber and having an outlet arranged independently of said mixer adapted to discharge the unburned or partially burned gas at a point intermediate of the gas burner and of said mixer, substantially as set forth and for the purposes specified.

2. In a gas heater having a chamber provided with a gas burner therein and with a gas and air mixer arranged on a plane below said gas burner, a return pipe extending heat into the i from above said gas burner, to a point below the same through said outlets until the same said gas burner, and having a plurality of is burned, substantially as set forth and for outlets arranged independently of said the purposes specified.

,. mixer on'a plane intermediate of said mixer THOMAS J. MCCARTHY. 5 and gas burner, said pipe being adapted to Witnesses:

carry the unburned or partially burned gas J AMES N. RAMSEY,

from above said gas burner and todischarge CATHERINE DORAN.

" Copies of this P ent may be'obtained for five cents each, by addressing the Commissioner of P t t I i I Washington, D. C. 

